Display text from file in a editbox

[knugen]

I have the file test.txt and in that it says "testing" and when I click a button in my program I want the text in the file to be displayed in a editbox on my program.
How would I do this?

[Megatron]

Try this:

bool OpenFile(LPSTR sFileName, HWND hText) {
	HANDLE hFile;
	bool bSuccess;
	LPSTR pszText;
	DWORD dwLength;
	DWORD dwRead;

	hFile = CreateFile(sFileName, GENERIC_READ, NULL, NULL, OPEN_EXISTING, 
		FILE_ATTRIBUTE_NORMAL, NULL);

	if ( !hFile ) 
		return false;
	
	dwLength = GetFileSize(hFile, NULL);
	
	if(dwLength != 0xFFFF)
	{
		pszText = (char *)GlobalAlloc(GPTR, dwLength + 1);
		if (ReadFile(hFile, pszText, dwLength, &dwRead, NULL)) 
		{
			pszText[dwLength] = 0; 
			if( SetWindowText(hText, (LPCTSTR) pszText)) {
				bSuccess = true;
			}
		}
		GlobalFree((HGLOBAL) pszText);
	}
	else
	{
		MessageBox(NULL, "File cannot exceed 65535 bytes", "Error", MB_OK | MB_ICONEXCLAMATION);
		bSuccess = false;
	}

	CloseHandle(hFile);
	return bSuccess;
}

[Chris]

here is some sample code...

    DWORD    dwptr=0, dwSize=0, dwByteRead=0, dwSz=0;
    char *Buffer=NULL;
    HANDLE    pFile=NULL;
    
    pFile = CreateFile("E:\\Project X\\DataFile\\test.txt", 
            GENERIC_READ, 
            FILE_SHARE_READ,
            NULL, 
            OPEN_EXISTING,
            FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
            NULL);

    if (pFile != INVALID_HANDLE_VALUE)
    {
        // Get file size
        dwSz = GetFileSize(pFile, NULL);
        // Create buffer for storing the read data
        Buffer = new char[dwSz];
        memset(Buffer,0,dwSz);
        // Reset file pinter
        dwptr = 0;
        // Read the all the data in one short.
        ReadFile(pFile, Buffer, dwSz, &dwByteRead, NULL);
        // Display the read data into EDIT control
        SetDlgItemText(hWnd, IDC_EDIT1, Buffer);
        // Detele the buffer
        delete [] Buffer;
        // Close the opned definition file
        CloseHandle(pFile);
        return 1;
    }
    else
    {
        // Close the opened definition file
        CloseHandle(pFile);
        return 0;
    } 

regards,

[knugen]

Thanks guys that worked.
Only one thing though...
I'm using your code, Chris. And when I push the button it reads in the data in the editbox but it looks like this: testýýýý1
Hehe, how do I get rid of those wierd signs?

[Chris]

Juz correct this line will do.

dwSz = GetFileSize(pFile, NULL) + 1; 

:P 'coz my previous posted code is store all the read data into a structure, so it didn't hit this error.

regards,

[Chris]

I think Megatron do a good validation in his posted code, whereby he does check for the filesize is a valid or not before proceed to the next command line

Hence, i did amend my posted code

    DWORD    dwptr=0, dwSize=0, dwByteRead=0, dwSz=0;
    char *Buffer=NULL;
    HANDLE    pFile=NULL;
    
    pFile = CreateFile("E:\\Project X\\DataFile\\test.txt", 
            GENERIC_READ, 
            FILE_SHARE_READ,
            NULL, 
            OPEN_EXISTING,
            FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
            NULL);

    if (pFile != INVALID_HANDLE_VALUE)
    {
        // Get file size
        dwSz = GetFileSize(pFile, NULL);

        if (dwSz != INVALID_FILE_SIZE)
        {
            dwSz = dwSz+1;
            // Create buffer for storing the read data
            Buffer = new char[dwSz];
            memset(Buffer,0,dwSz);
            // Reset file pinter
            dwptr = 0;
            // Read the all the data in one short.
            ReadFile(pFile, Buffer, dwSz, &dwByteRead, NULL);
            // Display the read data into EDIT control
            SetDlgItemText(hWnd, IDC_EDIT1, Buffer);
            // Detele the buffer
            delete [] Buffer;
            // Close the opned definition file
            CloseHandle(pFile);
            return 1;
        }
        else
        {
            // Close the opened definition file
            CloseHandle(pFile);
            return 0;
        }
    }
    else
    {
        // Close the opened definition file
        CloseHandle(pFile);
        return 0;
    } 

regards,